Willy, Where are you located?
Randy Evans AE6YG On Sun, Jan 31, 2016 at 11:49 AM, new <pit...@williams-net.com> wrote: > I'm thinking of doing non-commercial 'calibrations' for > folks like us volt-nuts. > > Since I have three 3458s, three 732As, a 732b, a 4214, > an sr104, a 4210, all NIST cal'ed and I could do front-panel > adjustments for the 3457. > > Would anyone here like to do that? I would start by > replacing the cal battery, too. > > I could give the 'as found' and 'as left' numbers too, > for the meters that arrived with 'alive' batteries. > > Probably best to do it on fleabay to protect everyone > involved. > > If this post is a violation of volt-nuts policy, please take it down! > > Willy > > > > On 1/31/2016 12:00 PM, volt-nuts-requ...@febo.com wrote: > >> Send volt-nuts mailing list submissions to >> volt-nuts@febo.com >> >> To subscribe or unsubscribe via the World Wide Web, visit >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> or, via email, send a message with subject or body 'help' to >> volt-nuts-requ...@febo.com >> >> You can reach the person managing the list at >> volt-nuts-ow...@febo.com >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of volt-nuts digest..." >> >> >> Today's Topics: >> >> 1. Re: 3457A - should I preserve SRAM contents, or purposely >> corrupt them by removing power? >> (Dr. David Kirkby (Kirkby Microwave Ltd)) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Sun, 31 Jan 2016 10:54:10 +0000 >> From: "Dr. David Kirkby (Kirkby Microwave Ltd)" >> <drkir...@kirkbymicrowave.co.uk> >> To: Discussion of precise voltage measurement <volt-nuts@febo.com> >> Subject: Re: [volt-nuts] 3457A - should I preserve SRAM contents, or >> purposely corrupt them by removing power? >> Message-ID: >> < >> canx10hcqoek9n+a0pinrzdzvc3b4d7twyztkuzvx_n9nmwc...@mail.gmail.com> >> Content-Type: text/plain; charset=UTF-8 >> >> On 25 January 2016 at 11:12, Dr. David Kirkby (Kirkby Microwave Ltd) < >> drkir...@kirkbymicrowave.co.uk> wrote: >> >> As noted in another thread, I want to replace a battery in a 3457A that >>> has not been replaced in at least 11 years. The instrument has not been >>> calibrated in that time either. At the time it was purchased from a >>> dealer, >>> I was told it was within specification, but if I wanted it calibrated I >>> would need to pay. I never did have it calibrated, so have no historical >>> data about this. I've no idea when it was calibrated, and have no cal >>> certificate, so have no idea of the errors at the time of calibration. >>> >>> I now want to change the battery, *and* send it to Keysight for >>> calibration - I have a healthy skepticism of 3rd party labs, so would >>> rather pay more and get the job done by Keysight. >>> >>> I'm wondering if I would be better purposely removing the battery, and >>> putting a short across the SRAM so I ensure the contents are definitely >>> lost. My logic is that >>> >>> 1) If I send it to Keysight and the cal data is corrupt, they will set >>> the >>> meter correct. >>> >>> 2) If sent to Keysight, with the cal data in tact, then if its within >>> specification they will not adjust it. So if the limit on some parameter >>> is >>> 1%, and the error is 0.5%, then it will not be adjusted. But if the SRAM >>> is >>> corrupted, the error will be huge (if it will read at all), so it would >>> force Keysight to adjust it to the correct value. >>> >>> >> >> At that point the error should be effectively zero >>> >>> <snip> >> >> Thoughts? >>> >>> Someone sent me a private email, saying that if by purposely removed the >> power from the SRAM caused the 3457A to fail its self-tests, which is may >> well do, then Keysight may consider the 3457A needs repair, and so offer a >> fixed-price repair. Hence my "trick" to get this calibrated as accurately >> as possible would have backfired, and I'd be out of pocket. In fact, on a >> 3457A, the fixed-price-repair would probably cost more than the instrument >> is worth, as these are not worth a lot now. >> >> Hence I would not do this before getting clarification from Keysight. It >> might be possible to get them to set it right, even if within spec, but I >> think their calibration routines are very automated, so its probably not >> so >> easy to get a special calibration, whilst paying for their cheapest >> calibration service. >> >> Dave >> >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> volt-nuts mailing list >> volt-nuts@febo.com >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> >> ------------------------------ >> >> End of volt-nuts Digest, Vol 77, Issue 15 >> ***************************************** >> >> > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.